I have added a video showing it working with the music demo and all keys working.
Vintage Casio PT-20 Electronic keyboard and mini synthesizer Made in Japan
Casio PT-82 Electronic Keyboard with ROM Pack RO-551 World Songs . Fully Working
Rare Vintage 1983 Casio Casiotone 610 Electronic Musical Keyboard Metal Working
Casio PT-87 Electronic Keyboard With ROM Pack RO-551 World Songs Boxed Working
Casio PT30 Vintage Electronic Keyboard Synthesizer Mini - Full Working Order
